President-elect Trump has promised to impose 25% tariffs on all goods imported from Canada and Mexico, and tariffs as high as 60% on goods coming from China on day one of his new administration. What will these protectionist policies accomplish?

The U.S. is the largest importer of goods in the world, with Mexico, China and Canada its top three suppliers, according to the most recent census data.

If it moves, tax it,” as Ronald Reagan once said, describing the government’s view of the economy. Donald Trump appears to hold a similar perspective on tariffs. We might soon find out whether crucial US energy supplies keep moving,